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Questions tagged [metals]

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1answer
105 views

Copper mining in ancient Israel

The Torah promises [successful] copper mining in Israel's mountains: אֶרֶץ אֲשֶׁר ... וּמֵהֲרָרֶיהָ תַּחְצֹב נְחֹשֶׁת׃ a land ... from whose hills you can mine copper. (Deut 8.9) I tried to ...
2
votes
1answer
41 views

Why do unfinished wooden utensils have a different law than unfinished metal utensils?

In Keilim 12:8, we see that unfinished wooden utensils with a receptacle are susceptible to tumah, except those woods whose properties make the utensil unusable. ‮... כל גולמי כלי עץ טמאין, חוץ משל ...
4
votes
1answer
81 views

Supporting schach on a sukkah

I understand that it is preferable to support schach with materials that would themselves constitute schach. I cannot find any information on whether it is permissible to use metal screws/nails to, ...
3
votes
2answers
1k views

How do I build a cheap metal pole sukkah?

Trying to build a metal pole sukkah... I was wondering if anyone had experience building one from scratch using stuff from a local Lowes or Home Depot. I was going to use PVC piping but that sways and ...
3
votes
1answer
97 views

Metal on Foods at Time of Tekufa

The Kitzur writes (33:8) that at the time of the tekufa, one should place a piece of metal on all non-cooked, non-pickled, or non-salted, food and drink. I know that this is not followed nowadays, but ...
4
votes
2answers
217 views

Can one kasher anodized metal?

Anodized metal is metal with an increase in the thickness of the natural oxide layer on the surface of metal parts. Is there any issue kashering it, or is it basically like metal with a layer of rust ...
3
votes
3answers
161 views

Metal Kulmus for Sifrei Kodesh?

I was just looking at the Keset haSofer and came across an interesting halacha ואין נוהגין כן אלא כותבין בנוצה ואפי׳ בקולמס של ברזל This is to say that we may write with a metal kulmus * (pen for ...
2
votes
1answer
83 views

What kinds of metals need immersion in a mikvah?

Metal (and glass) utensils used for food require immersion in a mikvah. What counts as a metal for this purpose? Note that there is no universally accepted scientific definition of a metal.
1
vote
1answer
279 views

A metal frame above a sukkah

I have a small courtyard that I hope to make into a Sukkah. 1/3 of the courtyard is covered with a metal frame that is made up of a grid of metal pieces about 1cm thick - each spaced about 1/2 ...
6
votes
3answers
814 views

Sechach supported partially by metal

For those who are careful to only support their sechach on sechach-eligible materials, how much does it matter if a small amount of the sechach inadvertently rests on non-sechach-eligible materials? ...