Method of increasing Shocks, &fc. 137 



It will be necessary that the correspondent at the seaport should 

 write a letter of advice to the administrator of the Royal Manufac- 

 tory at Sevres near Paris, before the forwarding — that the latter 

 may obtain from the director general of the customs, that the box 

 may arrive under seal, sous plomb, and that it may not be opeped 

 at Paris : this is very important, to the end that there may be no de- 

 rangement of labels, nor any breakage. It is equally important that 

 the tickets which may indicate the places where the pieces were 

 made, or those from which they come, should not be separated and 

 mixed during the unpacking. It is desired therefore that they may 

 be fastened either with glue, or with good wafers, or with twine. 



Lastly, it is very desirable that there should be attached to the 

 case a separate box, either of lead or of tin, or that there should be 

 sent separately, notes, previously made, of the objects collected and 

 forwarded ; taking care that a correspondence be established between 

 the objects and the notes, by means of numbers, which shall follow 

 each other, or by numbering the series. 



Alexandre Brongniart, 



Art. XI. — Method of increasing shocks, and experiments, with 

 Prof. Henry's apparatus for obtaining sparks and shocks from 

 the Calorimotor ; by C. G. Page. 



Salem, May 12th, 1836. 



PROFESSOR SILLIMAN. 



Dear Sir — I have lately constructed an apparatus for obtaining 

 shocks from the calorimotor, which has furnished some curious results, 

 and as you may perhaps, deem them worthy of publication, I send 

 you herewith, a sectionaldrawing of the apparatus with a description. 



6 5 4 3 2 1 



The figure represents a Section of an apparatus for obtaining shocks 

 from the calorimotor. The coil of copper ribbon, contained in the 

 box b, is 220 feet long, an inch wide, and has but four solderings or 



Vol. XXXI.— No. 1. 18 



