462 



CENTBAL SCIENTIFIC CO., CHICAGO, TJ. S. A. 



No. 12736. 



No. 12748. 



12692. SPEED COUNTER or REVOLUTION COUNTER, suitable for any purpose requiring a small, 

 light and accurate counter. Registers up to 99,999. Its action is very smooth and uniform 

 and it will stand a very high rate of speed. If run backwards, it counts backwards. Illustra- 

 tion is full size. Nickel-plated $1.50 



12694. SPEED COUNTER or REVOLUTION COUNTER, with ball thrust bearing and spring clutch 

 which allows the spindle to turn freely until the second hand of one's watch has come to zero; 

 a slight pressure on the end of the instrument starts the count; when pressure is released the 

 count stops. Registers 9,999, and can be used on either high speed or low speed machinery. 

 One pointed and one flat rubber tip furnished which serve as insulators when taking the speed 

 of electric machinery. The flat tip can also be used on flat or pointed shafts. Nickel-plated. 4.00 



12698. SPEED INDICATOR, improved form, may be run at highest speed required without heating; 

 dial plate has two rows of figures reading right or left; rubber tips for both pointed and cen- 

 tered shafts, which not only remove the jar and run smoothly, but produce a stronger fric- 

 tional contact with the shaft. The rotating disc, being carried by friction, may be moved to 

 the starting point where the raised knobs coincide. Pressing the raised knob on the rotating 

 disc with the thumb prevents the disc from moving until the hand of the watch gets to the 

 right position to take the time. Every hundred revolutions may be noted by feeling the knob 

 pass under the thumb, thus relieving the eye which has only to look on the watch to note the 



time. Nickel-plated 1.26 



See also DE LAY STOP-WATCH AND REVOLUTION COUNTER No. 12968. 



12714. 

 12718. 

 12722. 



12730. 

 12731. 

 12734. 



SPINTHARISCOPE, see Radioactivity Apparatus. 



SPLINTS, 100 in package per package 



SPONGES, for cleaning purposes, 16 to a pound per pound 



SPOON, Aluminum, table size, handle with ribbed center 



SPOONS, Deflagrating, see Deflagrating Spoons. 



SPOON, Glass, lamp blown, teaspoon 



SPOON, Glass, lamp blown, tablespoon 



SPOONS, Horn, plain form. 



Length, mm 100 



.11 



150 

 .18 



Each 



12736. SPOONS, Horn, with spatula end. 



Length, mm 



Each 



SPOONS, Platinum, see Platinum Ware. 

 SPOONS, Porcelain, with spatula end. 



Length, mm 96 



Each 21 



SPOON.^Sodium, of brass gauze, with cover and wooden handle 



SPOON, Sodium, Capsule, with ram-rod, according to Brownlee 



SPOONS, Sodium, cartridge shells, 8x13 mm inside Per dozen 



12742. 



120 

 .2V 



140 

 .38 



160 

 .50 



100 

 .20 



200 

 .75 



150 

 .22 



247 

 .85 



12744, 

 12746 

 12748 



.10 



2.00 



.20 



.30 

 .40 



200 

 .25 



200 

 .30 



490 



2.75 



.30 



.25 



.10 



