190 



Some Estimates of Cost of Projection Outfits. 



Outfit with Projection Apparatus with tilted Lamp. 

 Schuckert System. 



s. d. 



50,803. 1 Projection Apparatus with tilted Lamp 

 (Schuckfert system), tall form, for pro- 

 jecting Apparatus and Photographs, with 

 122 mm diameter condenser, achromatic 

 Projection Objective 55 mm diameter and 

 180 mm focal length, Optical Bench, Change 

 Frame with inset frame for taking photo- 

 graphs 8.5 x 10, 9 x 10.5 and 9 x 12 cm size 

 of plate, 1 Stage and 1 adjustable Slider 

 with stand for taking the Change Frame, the 

 stage, or other objects, with an auto-regu- 

 lating Direct Current Arc Lamp for 

 20 amps 18. 10. 



50,878. 1 Switchboard for connecting the Projec- 

 tion Apparatus up with the Wall . . . . 1. 10. 

 9,646. p. 1228. 1 Regulating Resistance for 



20 amps, at 110 Volts Direct Current. . 4. 15. 



51,007. 1 Projection Screen, 3 x3 m, of prepared, 

 pure-white fabric, for reflected light, with 

 draw-cord device for rolling up, for firmly 



fixing to the ceiling 3. 0. 



Cases and Packing for land transit ... 0. 17. 



Total 28. 12. 



In the case of Three-phase or Alternating 

 Current plants, a transformer No. 50,880 or 

 50,881 should be used in lieu of the regu- 

 lating resistance. The price is then de- 

 creased (for 220 Volts A. C.) by ... 1. 10. 



Outfit with a School Projection Apparatus, low 



Form, with Limelight Burner and hand-regulated 



Arc Lamp, for travelling Lecturers. 



50,738. 1 School Projection Apparatus, Model A, 

 low Form, for projecting Apparatus and 

 Photographs, with 122 mm diameter con- 

 denser, achromatic Projection Objective 

 55 mm diameter and 180 mm focal length, 

 Optical Bench, Change Frame with inset 

 frame for photographs 8.5 x 10, 9 x 10.5 and 

 9 x 12 cm size of plate, 1 Stage and 1 Slider 

 with stand for taking the change frame, the 

 stage or other objects, with Limelight 

 Burner for house gas and Oxygen . . . 11. 0. 



50.947. 1 Steel Flask for Oxygen 1. 16. 



50.948. 1000 litres Oxygen Charge 0. 10.0 



50,953. 1 Pressure Reduction Valve, with capacity 



indicator . . .... 2. 5. 



Carried forward 15. 11. 



s. <1 



Brought forward 15. 11. ' 

 51,025. Portable Bamboo Stand with Projection 



Screen 3 x3 in 4. 0. o 



Cases and Packing for laud transit ... 0. 15. () 



Total 20. 6. 



If it be desired to connect the appa- 

 ratus to a Direct or Alternating Current 

 electric network, the following must also 

 be provided for: 



50,890. Projection Arc Lamp, hand-regulated. . 2. 17. 

 50,871. Fixed Series Resistance for 15 amps, on 



220 Volts Direct Current 4. 0. 



50,881. Transformer for 220 Volts Alternating 



Current 3. 6. 



Cases and Packing for land transit ... 0. 2. 



Grand Total 30. 10. 



Outfit of Accessories for Projection Lanterns. 



s. d 

 2. 0. ii 



50,974. 4 Sliders with stands for prisms, etc., 

 each 10 s. 



50.975. -- 1 ditto, with lateral adjustment . . 0. 18. 



50.976. 1 Cooling Vessel 2. 0. 



50,980. 1 Bi-concave Lens 0. 18. 



50,982. 1 Collimator Lens 0. 18. 



50,986. 1 Adjustable Slit with micrometer screw 1. 8. 



50,987 a. -- idem, with diaphragmic disc . . 1. 16. 

 50,998. 1 Travelling Type Table with inclinable 



top 6. 0. d 



51,003. 1 Small, Transparent Projection Screen 0. 10 



Total 16. 8. 



Outfit of Auxiliary Apparatus for Projection. 



51,032. Apparatus for projection of Horizontal * 8 - " 



Objects 4. 5. 



51.046. Megascope for projecting opaque objects, 



large type 6. 10. 



51.047. Projection Microscope 2. 10. 



51,049 51,051. Objectives for above, No. 2, 3 



and 5 



51,055. Revolving collar for 3 Objectives . . . 



51,062. Collection of Microscopical Preparations 



51,057. Projection Microscope for observing 



solid, liquid and flowing Crystals by 



Lehmann's method 20. 15. 



51.059. 2 Nicol Prisms 6 0. 



51.060. Complete set of Accessories 10. 9. 6 



51,064. Projection Chromoscope (Ives') .... 12. 0. 



51,066 a. Diffraction Chromoscope 10. 0. 



51.067. Cinematograph 7. 10. 



51.068. Films, 50 m 3. 15. 



51,074. Polarisation Apparatus 7. 0. 



3. 18. 

 1. 2. 

 1. 15. 



O 



(C 



>i 



5 



Physical Apparatus for Projection. 



The following pages contain a list of those pieces of physical apparatus which are used in 

 conjunction with the projection lantern. 



Further details as to these, illustrations, references to literature on the subject, etc. are to 

 be found in the previous edition of our Price List No. 21 and in the supplements, under the respective 

 List Numbers. 



We hold a large selection of photographs, diapositives, microscopical preparations, etc. When 

 requiring such, we should be glad if application be made for our complete list of these, stating in 

 connection with which branch of the sciences the photographs and preparations are chiefly desired. 



