stage which reflects the light through the microscope and a 
prism is fitted over the eyepiece to project the picture forward 
upon the screen. Adjustment is given to the arc lamp for its 
accurate centring. In No. 4954 the arc lamp burns at 5 amps. 
and is hand fed, but a clockwork feed can be incorporated, which 
moves the carbons at approximately the rate at which they burn, 
Due to the variation in the rate of burning in individual carbons, 
an occasional adjustment by hand may be required, but the 
clockwork feed saves the continual adjustment necessary on a 
hand feed lamp. In No. 4957 the arc lamp is magnetically 
controlled and takes 5-10 amps. 
The projector will show a well illuminated picture up to 8 
feet diameter. 
The University Micro-Projector. 
No. 4954. University microprojector with hand feed arc lamp and duplex substage 
condenser... us, or se ae ase on sins ee Loo. Le 
No. 4956. Clockwork feed for lamp on No. 4954 3.5 
No. 4957. As No. 4954, but with magnetically controlled automatic arc lamp 5-10 amps. 
for direct current ... see Ses sa Si So aes cea tO 0 
No. 4955. Mirror and prism for using microscope vertically... nor er es 292 20 
No. 3637. Adjustable resistance for Nos. 4954 and 4956 for voltages 100-250 D.C, 
or A:C. oe Ses Se ae ie as oes sa Js 2 2 0 
No. 3329A. Resistance for No. 4957, 5 amps. for D.C. 200-240 volts... ee ee ZalT 9 
No. 3329B. Resistance for No. 4957, 5 amps. for D.C. 100-120 volts... ee Bor WU) 
No. 3329C. Resistance for No. 4957, 10 amps. for D.C. 200-240 volts ... ade wis 2712, 6 
No. 3329D. Resistance for No. 4957, 10 amps. for D.C. 100-120 volts ... aie bes 110 0 
No. 2171. Carbons, best quality 6 m/m. for No, 4954... sf Sie per doz. 0 2 3 
No. 2172. Carbons, best quality 8 m/m. for No. 4954... ae ae ee OF 3526 
No. 2173. Carbons, best quality 7 m/m. for No. 4954... nes ae sed ee O22259 
No. 2174. Carbons, best quality 5 m/m. solid for No. 4957 (5 amps.) ... on: Oras © 
No. 2175. Carbons, best quality 5 m/m. cored for No. 4957 (5 amps.) re 0 1 10 
No. 2176. Carbons, best quality 9 m/m. solid for No. 4957 (10 amps.) [re 0 8 3 
No. 2177. Carbons, best quality 9 m/m. cored for No. 4957 (10 amps.) eins OMG 50 
A model of No. 4957 is made for alternating current particulars on application. 
105 
