Estimates of Cost for Physical Apparatus. 1075 



Estimates of Cost for Physical Apparatus. 



For estimates as to equipments for Physical and Chemical Lecture Booms, Preparation Boom, 

 Museums, Students' Workrooms, compiled with due consideration to the means available, and which 

 generally include a lecture table: see pp. 99 106 (Vol. I). 



For estimates as to Projection Lanterns and Accessories: see pp. 189 and 190. Estimates as 

 to Kohl's Megadiascope (Universal Projection Apparatus) and special fittings: see p. 1230 (sewn in 

 after p. 192, Vol. I). 



Table of prices of Physical Apparatus for projection purposes: see pp. 1094 1096, which 

 supersede pp. 190 192 in Vol. I. 



It is assumed in the following collection of estimates that the requisite fittings are at hand, 

 and especially the necessary museum cupboards for the apparatus, a connection to a gas lead and 

 an electric lead supplied with D. C., including for the latter a suitable experimental switchboard, 

 also a projection apparatus together with projection screen and a window obscuring device. 



Attention should be paid to the fact that in the case of platinum objects or apparatus in 

 which the use of platinum essentially influences the price, the prices will undergo variation with 

 any change in the price of platinum. 



Estimates Nos. 14. Collections of Apparatus in accordance with Standard Requirements. 



The Standard List (Normalverzeichnis) was presented and accepted at the Fifth General 

 Meeting of the Society for Promoting Instruction in Mathematics and the Natural Sciences, Elber- 

 feld, Autumn 1896 (see also Unterrichtsblatter fur Mathematik und Naturwissenschaften, 2, 1896, 

 page 24). 



The Collections of Apparatus included in the following pages each form an entire whole; 

 they can, however, should the full amount not at once be available, be installed little by little in 

 such manner that the apparatus of Collection 1 included in the column "1 st Acquirement" should be 

 ordered first, while, in a similar manner, the apparatus given under "2 nd Acquirement" should be 

 ordered additionally in the following or in a number of successive school years. 



If, however, the apparatus for each branch of Physics are desired complete at the outset, 

 the apparatus for the various branches can be ordered successively. 



The numbers given in special columns refer to the "Standard List" mentioned above. The 

 order is, however, kept in accordance with the present Price List. 



In perusing the estimates it should be noted that only such apparatus pertain to a collection 

 in which the price is inserted in the corresponding price column. Price Lists containing only these 

 apparatus can be obtained from us. 



Collection 1 in addition to containing all apparatus mentioned as generally necessary for 

 Higher Institutions in the "Normalverzeichnis fur die physikalischen Sammlungen der hoheren Lehr- 

 anstalten", include, as well, all apparatus indicated as being desirable. Moreover, a series of appa- 

 ratus has been considered which are now generally ordered at the same time. 



Collection 2 contains, under the objects designated by "1 st Acquirement", all apparatus 

 designated as necessary for "Higher Educational Institutions" and, in addition, an ample number 

 of apparatus generally considered as desirable, and of new apparatus. The apparatus designated 

 "2 nd Acquirement" are in part designated as desirable and have, in part, been introduced during the last 

 year or two. This Collection includes, like the previous one, an induction coil sufficient for produc- 

 ing Bontgen Bays, for Tesla high frequency experiments, etc. 



Collection 3 comprises under the apparatus designated as "1 st Acquirement" only those articles 

 which are indicated as generally necessary for Higher Educational Institutions. For the "2 nd Acquire- 

 ment", which reaches nearly as high a sum as the "1 st Acquirement", a number of the apparatus 

 considered as desirable and a few more recent apparatus have been included. 



Collection 4 is intended for the minor institutions (such as the "Progymnaskn" in Germany). 

 It comprises for the "I 8t Acquirement" all apparatus designated as generally necessary for these 

 institutions; and for the "2 nd Acquirement" all those generally designated as desirable. By restricting 

 the selection of the latter, the total sum can be diminished. This Collection is also well adapted 



for Continuation Schools, etc. 



